期刊
出版社
ELSEVIER
DOI: 10.1016/j.nima.2021.165848
关键词
Neutron spectrometer; Energy spectrum; Monte Carlo simulation; Boron neutron capture therapy
类别
资金
- JSPS, Japan [19H03711]
- National Defense Academy of Japan
- Grants-in-Aid for Scientific Research [19H03711] Funding Source: KAKEN
The neutron spectrometer designed for measuring low-energy neutron beam for boron neutron capture therapy (BNCT) uses a boron carbide block as a neutron moderator and nine thin neutron silicon sensors with variable detection efficiency. By simulating the spectrometer's neutron energy response functions, it is able to increase neutron detection efficiencies to measure the BNCT neutron beam in a short time.
We designed a neutron spectrometer to measure low-energy neutron beam for boron neutron capture therapy (BNCT) without exchanging thicknesses of neutron moderator. The spectrometer consists of a boron carbide block as a neutron moderator and nine thin neutron silicon sensors with variable detection efficiency. Using the Monte Carlo technique, we simulated the spectrometer's neutron energy response functions. It represented sharp rise in the response functions with various lower limits of neutron energies distributed over a wide range of neutron energy from a thermal energy to a few 100 keV. The lower limit of neutron energy was dependent on a depth in the boron carbide block. By applying thicker enriched (LiF)-Li-6 neutron converter and covering the deep positioned neutron sensors with polyethylene plates, neutron detection efficiencies were increased to be able to measure the BNCT neutron beam in a short time.
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